Abstract
Pressure broadening of the X-band EPR spectrum of molecular oxygen was studied in an apparatus designed to minimize systemtic and random errors in the collisional linewidth. Results are reported for 16 lines with rotational quantum number N ranging from 1 to 11. No explicit M dependence of linewidth at the 1% accuracy level was found except that the N = 1, J = 1 line with initial M value of 0, which is at a substantially higher field than the other N = 1 lines, was found to be significantly broader than the other N = 1 lines. Otherwise, a slight but definite decrease of width with increasing field was found, presumably due to magnetic alignment of O2. Over the 0.5 to 2.3 Torr pressure range studied there was a remarkable variation of width with pressure, implying a small negative linewidth at zero pressure, for which we were unable to find a satisfactory explanation in theory or systematic measurement errors.
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